CI: statically check stack size on Linux (#3055)

.github/workflows/ci.yml

@@ -120,6 +120,12 @@ jobs:
           echo "ARCH=$ARCH" >> $GITHUB_ENV
           echo "PLATFORM=$PLATFORM" >> $GITHUB_ENV
 
+          # Stack usage test on recent enough gcc:
+          if [[ '${{ runner.os }}' == 'Linux' && '${{ matrix.target.cpu }}' == 'amd64' ]]; then
+            export NIMFLAGS="${NIMFLAGS} -d:limitStackUsage"
+            echo "NIMFLAGS=$NIMFLAGS" >> $GITHUB_ENV
+          fi
+
           # libminiupnp / natpmp
           if [[ '${{ runner.os }}' == 'Linux' && '${{ matrix.target.cpu }}' == 'i386' ]]; then
             export CFLAGS="${CFLAGS} -m32 -mno-adx"

config.nims

@@ -43,7 +43,8 @@ if defined(cwarnings):
 if defined(limitStackUsage):
   # This limits stack usage of each individual function to 1MB - the option is
   # available on some GCC versions but not all - run with `-d:limitStackUsage`
-  # and look for .su files in "./nimcache/" that list the stack size of each function
+  # and look for .su files in "./build/", "./nimcache/" or $TMPDIR that list the
+  # stack size of each function.
   switch("passC", "-fstack-usage -Werror=stack-usage=1048576")
   switch("passL", "-fstack-usage -Werror=stack-usage=1048576")
 

vendor/nimbus-build-system

@@ -1 +1 @@
-Subproject commit 5fbffb22859a85aa0dc3e9238cc03d92ab197682
+Subproject commit e5bc3dd3a2736d0226c90c8300746069fdb69174